/*
 * Copyright (c) 2007-2009, Petr Panteleyev
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice,
 *       this list of conditions and the following disclaimer in the documentation
 *       and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.panteleyev.music;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

/**
 *
 * @author Petr Panteleyev
 */
class ITunesMac implements IMusicPlayer {
    private static final String CURRENT_TRACK_SCRIPT =
        "set tab to \"\t\"\n" +
        "tell application \"iTunes\"\n" +
        "try\n" +
        "set r to current track\n" +
        "set myvalue to (album of r & tab & artist of r & tab & track number of r & tab & name of r)\n" +        
        "end try\n" +
        "end tell";

    private static final ScriptEngine engine = new ScriptEngineManager().getEngineByName("AppleScript");

    @Override
    public MusicTrackInfo getCurrentTrack() {
        if (engine != null) {
            try {
                Object res = engine.eval(CURRENT_TRACK_SCRIPT);

                if ((res != null) && (res instanceof String)) {
                    String[] parts = ((String)res).trim().split("\t");
                    return (parts.length == 4)?
                        new MusicTrackInfo(parts[1], parts[0], parts[3], Integer.parseInt(parts[2])) : null;
                } else {
                    return null;
                }
            } catch (ScriptException ex) {
                return null;
            }
        } else {
            return null;
        }
    }    
}
